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If via HBASE-794 first class support for talking via Thrift directly to HMaster and HRS is available, then pure C and C++ client libraries are possible.

The C client library would wrap a Thrift core.

The C++ client library can provide a class hierarchy quite close to o.a.h.h.client and, ideally, identical semantics. It should be just a wrapper around the C API, for economy.

Internally to my employer there is a lot of resistance to HBase because many dev teams have a strong C/C++ bias. The real issue however is really client side integration, not a fundamental objection. (What runs server side and how it is managed is a secondary consideration.)